US3380714A - Correction system for use in carrying out line-operations in an underwater borehole - Google Patents

Correction system for use in carrying out line-operations in an underwater borehole Download PDF

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Publication number
US3380714A
US3380714A US598023A US59802366A US3380714A US 3380714 A US3380714 A US 3380714A US 598023 A US598023 A US 598023A US 59802366 A US59802366 A US 59802366A US 3380714 A US3380714 A US 3380714A
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US
United States
Prior art keywords
line
correction
borehole
pulley
operations
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US598023A
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English (en)
Inventor
Martin Leonard Roy
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BP PLC
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BP PLC
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Filing date
Publication date
Application filed by BP PLC filed Critical BP PLC
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Publication of US3380714A publication Critical patent/US3380714A/en
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/08—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods
    • E21B19/09—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods specially adapted for drilling underwater formations from a floating support using heave compensators supporting the drill string

Definitions

  • a floatable rig for carrying out line-operations in an underwater borehole the rig being provided with a correction system for the borehole-line, the system having a correction line connected to a point fixed relative to the earth and to a correction pulley in engagement with the borehole-line, by which the length of borehole cable payed out in response to the rise and fall of the tide and wave action, is adjusted to correct for the vertical motion of the floating rig.
  • This invention relates to a correction system for use in carrying out line-operations in an underwater borehole.
  • the work can be carried out from a platform equipped with retractable legs.
  • the legs stand on the sea bed and hold the platform clear of the surface of the water and this enables drilling operations to be carried out in a similar manner to land operations.
  • deeper water e.g., 20 fathoms, it becomes necessary to carry out operations from a vessel which is floating on the water and which is therefore subject to the rise and fall of tide and wave action.
  • a correction system for use during line-operations carried out from a floating vessel which has a winch for unwinding borehole-line and a series of one or more pulleys for directing the boreholeline into a borehole, comprises a correction line connected to a point fixed relative to the earth and to a correction pulley in engagement with the borehole line, the connection to the fixed point being such that a downward motion of the vessel tightens, and an upward motion slackens, the correction line and the connection to the correction pulley being such that the tightening of the correction line is transferred to the borehole line so as to take it in, and the slackening so as to pay it out, whereby the length of borehole cable payed out is ad justed to correct for the vertical motion of the floating vessel.
  • the correction line is secured to the floating vessel after passing around a secondary correction pulley which is attached to the correction pulley.
  • the borehole line is unwound from a winch at deck level, passed from a deck pulley over a travelling block which can be lowered to the bottom or" the drilling mast to rig the system and then hauled to the top to guide the borehole line into the borehole.
  • a correction system according to the invention may he rigged so that the correction passes line over the travelling block followed by the secondary correction pulley after which it is secured to the travelling block; the borehole line is passed over the deck pulley and then over the correction pulley which is attached the secondary correction pulley.
  • FIGURE 1 illustrates a correction system according to the invention
  • FIGURE 2 illustrates a modification in which the correction is applied at an alternative position in the borehole line.
  • Both figures illustrate a correction system according to the invention arranged for use in the carrying out of a line-operation in a borehole which is being drilled in the sea bed and a conductor pipe runs from this equipment to the surface.
  • the conductor pipe is secured to the sea bed and therefore it forms a convenient reference point fixed relative to earth.
  • a borehole line 11 is unwound from a winch 12 passes around deck pulley 13 and over correction pulley 14 which guides the borehole line 11 into the conductor pipe and therefore into the borehole.
  • the correction system comprises the correction line 16 which is made fast to the fixed point 1 7 situated near the top of the conductor pipe 1%).
  • the correction line 16 passes around the adjustment pulley 18 over travelling block 15 (which is positioned near the top of the drilling mast during the operation), is looped around secondary correction pulley 19 and is passed back to the mounting of travelling block 15 where it is secured.
  • the secondary correction pulley 19 is connected to the correction pulley 14 so that tension in the borehole line 11 is applied to the correction line 16.
  • FIGURE 1 When a vessel at sea is engaged in line-operations the whole of FIGURE 1 rises and falls under the influence of tide and wave action except the conductor pipe 10.
  • the operation of the correction system to eliminate this motion from the borehole line 11 will be explained by considering a downward motion of the vessel. This downward motion is equivalent to an upward motion of the point 17 while all other points remain stationary and the mode of operation will be explained from this point of view since this is easier to follow.
  • FIGURE 2 shows a modification in which the borehole line 11 passes over the deck pulley 13 and around correction pulley 14 and then over the travelling block which guides the borehole line 11 into the conductor pipe and therefore into the borehole.
  • the correction system comprises the correction line 16 which is made fast to fixed point 17 on conductor pipe 10.
  • the correction line 16 passes around the adjustment pulley 18, is looped round the secondary correction pulley 19 and passed back to the mounting of the adjustment pulley 18 Where it is secured.
  • the secondary correction pulley 19 is connected to correction pulley 14 so that the tension in the borehole line 11 is applied to the correction line 16.
  • the correction pulley 14 is situated below deck and funcan underwater borehole, said rig comprising a boreholeline, a winch for unwinding the borehole-line and at least one pulley for directing the borehole-line into the borehole, a correction system which comprises a correction line connected to a point fixed relative to said rig and to a point fixed relative to earth, a correction pulley which engages with the borehole-line, and a secondary correction pulley which is connected to said correction pulley and engages with said correction line between said points such that a downward motion of the floatable rig tightens, and an upward motion slackens, the correction line and said tightening and slackening are transferred to the borehole-line by the correction pulley so as to take it in and pay it out whereby the length of borehole-line payed out is adjusted to correct for the vertical motion of the iloatable rig
  • said correction system includes a conductor pipe which provides the point fixed relative to the earth to which said correction

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
US598023A 1965-12-06 1966-11-30 Correction system for use in carrying out line-operations in an underwater borehole Expired - Lifetime US3380714A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5164465 1965-12-06

Publications (1)

Publication Number Publication Date
US3380714A true US3380714A (en) 1968-04-30

Family

ID=10460837

Family Applications (1)

Application Number Title Priority Date Filing Date
US598023A Expired - Lifetime US3380714A (en) 1965-12-06 1966-11-30 Correction system for use in carrying out line-operations in an underwater borehole

Country Status (6)

Country Link
US (1) US3380714A (pm)
BE (1) BE690773A (pm)
DE (1) DE1251705B (pm)
DK (1) DK112791B (pm)
FR (1) FR1502515A (pm)
NL (1) NL6617110A (pm)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4252190A (en) * 1979-02-22 1981-02-24 Standard Oil Company (Indiana) Wireline stabilization method and apparatus
US20150316679A1 (en) * 2014-05-05 2015-11-05 Vale S.A. Method and system for density correction for geophysical well logging inside drilling rods

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2128057A1 (en) * 1971-03-02 1972-10-20 Petroles Cie Francaise Cable tension compensator - for rise and fall of vessel eg oil drilling rig, due to wave motion

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2809435A (en) * 1955-12-19 1957-10-15 California Research Corp Apparatus for maintaining proper depth correlation in well logging apparatus
US3001396A (en) * 1958-02-14 1961-09-26 James L Cleveland Apparatus for maintaining proper depth correlation in well logging apparatus
US3208728A (en) * 1962-11-19 1965-09-28 Exxon Production Research Co Apparatus for use on floating drilling platforms
US3276746A (en) * 1963-10-10 1966-10-04 Inst Francais Du Petrole Stabilizing device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2809435A (en) * 1955-12-19 1957-10-15 California Research Corp Apparatus for maintaining proper depth correlation in well logging apparatus
US3001396A (en) * 1958-02-14 1961-09-26 James L Cleveland Apparatus for maintaining proper depth correlation in well logging apparatus
US3208728A (en) * 1962-11-19 1965-09-28 Exxon Production Research Co Apparatus for use on floating drilling platforms
US3276746A (en) * 1963-10-10 1966-10-04 Inst Francais Du Petrole Stabilizing device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4252190A (en) * 1979-02-22 1981-02-24 Standard Oil Company (Indiana) Wireline stabilization method and apparatus
US20150316679A1 (en) * 2014-05-05 2015-11-05 Vale S.A. Method and system for density correction for geophysical well logging inside drilling rods
CN105089621A (zh) * 2014-05-05 2015-11-25 淡水河谷公司 用于对钻杆内部的地球物理测井进行密度校正的方法及系统
US9778393B2 (en) * 2014-05-05 2017-10-03 Vale S.A. Method and system for density correction for geophysical well logging inside drilling rods
US10401530B2 (en) 2014-05-05 2019-09-03 Vale S.A. Method and system for quality control in gamma-gamma data during mineral exploration
CN105089621B (zh) * 2014-05-05 2020-06-16 淡水河谷公司 用于对钻杆内部的地球物理测井进行密度校正的方法及系统

Also Published As

Publication number Publication date
DE1251705B (de) 1967-10-12
NL6617110A (pm) 1967-06-07
DK112791B (da) 1969-01-20
FR1502515A (fr) 1967-11-18
BE690773A (pm) 1967-06-06

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